BT TV is basically Freeview mixed with Now TV unlike TalkTalk TV which has a similar setting, you can watch the live channels without going into the Now TV app so you can watch these channels just like you would with Sky. There is also access to other streaming services like Netflix.
However, make sure your favourite TV Channels are available on BT TV before quitting Sky. Sky Max,Sky Showcase,Sky Crime,Sky History,Sky Documentaries,Sky Arts,National Geographic,Comedy Central,Sky Sports channels,BT Sport channels and there some kids channels too
All other channels are provided as freeview channels.
Make sure you get a good TV signal with Freeview before signing up to this service.
If you don't get good freeview signal were you are, I would recommend keeping Sky or try Virgin Media which has just as many channels as Sky.
The whole experience with BT TV is destroyed if you can't get a good freeview signal. Its recommended to have a good rooftop aerial or of you live in a block of flats/maisonettes a communal aerial.
BT will also not sell you BT TV if they feel there isn't enough bandwidth on your Broadband as again this will prevent you using the service, BT TV is a combination of terrestrial and IPTV
